package dujiu.luogu.sequence;

import java.util.Scanner;

public class B2029 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int height = scanner.nextInt();
        int row = scanner.nextInt();
        int total = 20 * 1000;
        System.out.printf("%.0f",total/((3.14 * row * row) * height)+1);
    }
}
